<template>
    <div :class="className" :style="{ height: height, width: width }">
    <!-- 图表容器 -->
    <div ref="chartContainer" style="width: 100%; height: 100%;" />
    </div>
</template>

<script>
import echarts from 'echarts'
require('echarts/theme/macarons') // echarts theme

// 处理月份数据
function padMonthData(expectedData, monthLabels) {
  if (expectedData.length >= 12) {
    return {
      expectedData: expectedData.slice(0, 12),
      monthLabels: monthLabels ? monthLabels.slice(0, 12) : ['一月', '二月', '三月', '四月', '五月', '六月', '七月', '八月', '九月', '十月', '十一月', '十二月']
    }
  }

  const defaultMonthLabels = ['一月', '二月', '三月', '四月', '五月', '六月', '七月', '八月', '九月', '十月', '十一月', '十二月']
  
  const paddedData = [...expectedData, ...Array(12 - expectedData.length).fill(null)]
  const paddedLabels = monthLabels 
    ? [...monthLabels, ...defaultMonthLabels.slice(monthLabels.length)]
    : defaultMonthLabels

  return {
    expectedData: paddedData,
    monthLabels: paddedLabels
  }
}

export default {
    props: {
    className: {
        type: String,
        default: 'chart'
    },
    width: {
        type: String,
        default: '100%'
    },
    height: {
        type: String,
        default: '350px'
    },
    chartData: {
        type: Object,
        required: true
    }
    },
    data() {
    return {
        chart: null
    }
    },
    watch: {
    chartData: {
        deep: true,
        handler(val) {
        this.setOptions(val)
        }
    }
    },
    mounted() {
    this.$nextTick(() => {
        this.initChart()
    })
    },
    beforeDestroy() {
    if (this.chart) {
        this.chart.dispose()
    }
    },
    methods: {
    initChart() {
        this.chart = echarts.init(this.$refs.chartContainer, 'macarons')
        this.setOptions(this.chartData)
    },
    setOptions({ expectedData, monthLabels } = {}) {
        const { expectedData: paddedData, monthLabels: paddedLabels } = padMonthData(expectedData, monthLabels)
        this.chart.setOption({
        xAxis: {
            data: paddedLabels || ['一月', '二月', '三月', '四月', '五月', '六月', '七月', '八月', '九月', '十月', '十一月', '十二月'],
            boundaryGap: false,
            axisTick: {
            show: false
            },
            axisLabel: {
            rotate: 60 // 旋转60度
            }
        },
        grid: {
            left: 10,
            right: 20,
            bottom: 20,
            top: 30,
            containLabel: true
        },
        tooltip: {
            trigger: 'axis',
            axisPointer: {
            type: 'cross'
            },
            padding: [5, 10]
        },
        yAxis: {
            axisTick: {
            show: false
            },
            axisLabel: {
            show: true,
            formatter: function(value) { return value.toFixed(1) + 'mg/L' }
            }
        },
        legend: {
            data: ['溶解氧']
        },
        series: [{
            name: '溶解氧',
            itemStyle: {
            normal: {
                color: '#3888fa',
                lineStyle: {
                color: '#3888fa',
                width: 2
                }
            }
            },
            smooth: true,
            type: 'line',
            data: paddedData,
            animationDuration: 2800,
            animationEasing: 'cubicInOut'
        }]
        })
    }
    }
}
</script>